code: def map(self):
      kwargs = {
          "color": None,
          "pickable": True,
          "rgba": True,
      }
      mesh_data = self._renderer.mesh(
          x=self._vertices[:, 0],
          y=self._vertices[:, 1],
          z=self._vertices[:, 2],
          triangles=self._triangles,
          normals=self._normals,
          scalars=self._default_scalars,
          **kwargs,
      )
      self._actor, self._polydata = mesh_data
      self._is_mapped = True
  
file_path: mne-python/mne/viz/_3d_overlay.py
imports: from collections import OrderedDict
  import numpy
  from ..utils import logger
label_desc: Use image node_id 2 for calling the _LayeredMesh obj's underlying member method code with example usage: obj.map() without return types